Spacer



FIG. 1 is a perspective front view of a spacer, showing my new design;

FIG. 2 is a perspective rear view thereof;

FIG. 3 is a front right view thereof;

FIG. 4 is a front left side view thereof;

FIG. 5 is a rear side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in the drawings illustrate portions of the spacer that form no part of the claimed design. 

CLAIM The ornamental design for spacer, as shown and described. 